US2323567A - Oil burner - Google Patents

Description

July 6, 1,943. F. RAvNsBEcK 2,323,567

OIL BURNER Filed Sept. 27, 1940 Patented July 5, 1943 OL BURNER Fred Ravnsbeck, Chicago,

Co., Chicago, illl., 'a `corporaticn of Engineering illinois Application September 27,

lll., assigner to Ace i940, Serial No. 358,574

i claim. rc1. 15s-77) This invention relates to the control of liquid in a conduit through which it normally ows in horizontal direction and in which the iiow is occasionally shut on. The invention is particularly concerned with means 'for wholly checking the i'iow when it is intentionally stopped so as to prevent the dripping of the liquid from the outlet end of the conduit.

One object of the invention is to provide means in a horizontal conduit which will permit the flow of liquid therethrough at any time under moderate pressure but will act to check such ow when the pressure is cut o.

yAnother object is to provide a form of dam for a horizontal flow passage which is adapted, without adjustment, to check the rlow oi liquid to the passage when substantially no pressure is applied thereto.

lt is also an object oi the invention to provide means to be tted into a rotatable horizontal conduit for checking the flow of liquid therethrough when the conduit is at rest and no pressure is applied to the liquid.

More specifically, the invention is shown and described as applied to an oil burner in which the iuel oil is fed to the point or combustion through a horizontal conduit which is in a rotating member, and the object oi the invention is to provide a dam in the bore oi the sha-it which prevents the dripping or oil therefrom when thepressure is shut off and the shaft is not rotating.

Other objects and advantages will `appear as the description proceeds. The invention consists in certain features and elements of con struction in combination, as herein shown and 3 described and as indicated by the claim.

In the drawing:

Figure l is a vertical axial section of a portion ol an oil burner showing this invention applied thereto.

Figure 2 is an axial sectional view of the oil reed conduit of the oil burner taken on a larger scale.

For illustrating one application or this tion the drawing shows a portion of an oil ce having a housing I in which there is journaled a shaft 2 which is hollow so as to serve as a con duit lfor feeding oil to the pointJ of combustion. The shaft is rotated by a motor, not shown, and within the housing l the shaft carries the rotor 3 of a centrifugal air pump or biower having outwardly extending passages l for the air. Air which is thus discharged under pressure travels between the vanes 5 toward the central portion of the housing and is ed from an annular oriflee 6 which surrounds the iiare-d outlet 'i secured to the end of the horizontal shaft 2. rlhus the oil which is fed 'through the shaft 2 is ythrown outwardly by centrifugal force at the cuter end of the part 1 and is then intermingled with the air issuing from the annular opening il. Suitable pumping means, not shown, serves to feed the oil through the horizontal bore of the shaft 2, but when the apparatus is shut down, as occurs frequently in the operation of an automatic oil burner under thermostatic control, the pumping means ceases to operate and in some cases an automatic valve is employed to insure that the flow of oil through the hollow shalt 2 shall stop. At the same time, the blower ceases to discharge air under pressure at the opening S and combustion is temporarily arrested. However, since there is always a small quantity of oil left in the flow passage through the shaft 2, if this passage is even slightly inclined toward the outlet end, such oil will gradually flow into the flared terminal l and will tend to drip therefrom onto the heated surfaces of the combustion chamber where it may not burn but will create smoke and cause a disagreeable odor. This is one situation in which it is desirable to wholly arrest the flow of liquid in a horizontal conduit when the pressure has been shut oli.

In the structure illustrated the outlet end of the hollow shaft 2 has its bore 2a fitted with a twisted strip of nat stock, shown at 8, and, preferably, this is simply a parallel-sided strip of steel or other metal twisted so that its oppositely helical edges 8a and 8b t snugly against the cylindrical wall of the bore in the shaft 2. Thus a drop of liquid owing along the bottom of this cylindrical wall 2a will be retarded by the oblique.. ly trending, warped surfaces of the twisted member 8, and will be deflected thereby. Bui; if the axis of the bore 2a is substantially level, and there is no pressure behind the liquid to advance it, the drop or other small quantity thus arriving at the twisted member 8 will be unable to climb along the inclined edge 0f this member which follows a helical course around the surface of the bore 2a. Hence, the member 8 will act as a dam to hold back any small accumulation of liquid in the bore 2a until pressure is applied or the shaft 2 begins to rotate.

Preferably, the member 8 is twisted in a direction such that it will act as a feed screw to assist the advance of liquid in the bore of the shaft toward the outlet when the shaft 2 is rotated in its normal direction; it will be understood that the pressure of the pumping means, not shown, is relied upon for feeding oil to the point of comwhen its flow is shut off at some distance back from the outlet. It will also be recognized that the twisted or volute strip Will not necessarily have both its edges in contact with the cylindriow passage, although that arrangement, as illustrated in the drawing, is perhaps the simplest to manufacture and the most eiective for the purpose. Thus it will be manifest to those skilled in the art that various modications and rearrangements of the structure may be made without departing from the spirit and scope of the invention, and that the same is not limited to the particular form herein shown In an oil burner said strip being twisted in a direction to facilitate the i'low of liquid through the bore toward the outlet when the member is rotated in the said predetermined direction, and said strip constituting the sole obstruction in the passage.

FRED RAVNSBECK.

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